RFR: JDK-8293450 Convert test/sun/management/ shell tests to Java version [v2]

[Bill Huang]

> There is no new changes in the open portion of JDK, but extracting common functionalities in bootstrap Utils to test/lib/Utils which can be used in the closed part.

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Implemented review comments.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11029/files
  - new: https://git.openjdk.org/jdk/pull/11029/files/98a7188e..191cd5ca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11029&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11029&range=00-01

  Stats: 47 lines in 1 file changed: 31 ins; 11 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11029.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11029/head:pull/11029

PR: https://git.openjdk.org/jdk/pull/11029